Nozzle for smoke abators



Patented May 5, 1925.

UNITED STATES PATENT OFFICE.

THOMAS w. ivrccuialor AKRON, 01110.

NOZZLE son SMOKE ABA'IORS.

Application filed October e, 1923. Serial No. 667,064.

a citizenof the United States, residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Improvement in a Nozzle for Smoke Abators, of which thefollowing is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to a nozzle for directing fluid over a hot bed of coals to promote the combustion of fresh fuel. and thereby prevent the formation of smoke. Mynozzlc is especially well adapted for mounting on the inner end of a steam pipewhich projects through the furnace wall and acts to direct the steam downwardly and at the same time spread it where it would be most effective. The object of the invention is to provide a simple, efficient and economically constructed nozzle for the purpose mentioned. The invention. is hereinafter more fully explained in connection with the drawings which show a preferred form of my nozzle.

In the drawings, Fig. 1 is a sectional side elevation of a furnace firebox equipped with my smoke abating nozzle; the remaining figures are views on a larger scale of the nozzle itself; Fig.2 being a side elevation; Fig. 3 a perspective; Fig. & a horizontal section on the offset plane indicated by the line 4l-4; .in Fig. 2; and Fig. 5 a vertical central section as indicated by the line 5-5 on Fig. 4-.

Referring first to Fig. 1, A indicates the grate bars of a furnace, B the admission door for fuel; C one of preferably several steam pipespassing through the front Wall; D indicates the nozzle which constitutes the present invention, this nozzle being adapted to project steam indicated conventionally at E. on the fuel bed F.

The nozzle D is preferably a single integral casting of steel ormalleable iron. It has ahmain body portion substantially rectangular in vertical cross section, that is to say,the ends are vertical, while the top and bottom walls are made of surfaces composed of horizontal lines. The bottom surface at the inner end curves upwardly abruptly as at 11, and .thetop surface curves. downwardlyfon a curve of larger radius as at 12, providing an overhanging lip'l8, the bottom of which is flat and in clined downwardly as shown at 1 L. On the other side of the body is preferably formed opening to the furnace.

a cylindrical boss 15. Internally the body is formed as follows: Centrally within the boss and extending into the body is a threaded bore terminating in a flattened conical portion 21. From this conlcal portion of the bore lead a plurality of smaller cylindrical bores, preferably the central one 23, and oblique ones on each side thereof designated 24, two of these oblique bores being shown on each side of the central bore 23. From the far end'of each passageway23, 24, a central minute opening .35 leads to the face of the nozzle immediately adjacent: the flat face 14L of the overhang ing lip. j

, In use thenozzle is screwed onto the inner end of one ofthe pipes G above the fuel 7 The downward incline of the under face 14: of the lip is such that steam emitted through the minute passageway 25 impinges against the inclined surfaces 14 and is directed downwardly by it onto the fuel and the products of combustion immediately above it.

By making the passageways of the form shown, the steam which comes to the nozzle under boler pressure is emitted with great velocity, the pressure behind it in the pipe C and then in the smaller bores forcing it through the minute passageways and against the deflector provided by the overhanging lip. The minuteness of the passageways surrounded by the comparatively large volume of metal which is hot from the fire operates to superheat the steam passing through the nozzle, preventing the discharge of any suspended water. The immediately adjacent fiat lip against which the fine sprays of steam are projected further breaks up the steam, and this, together with the spreadmg form of the passageways separates the steam into a sheet of very finespray which forms a canopy over the fuel in that region where the products of combustion rise from it and pass over the bridge wall at the rear of the grate. By this means complete combustion is obtained of the freshly applied fuel, and the dense smoke which would otherwise rise therefrom eliminated.

It should be noted that by making the minute passageways extend in their minute form only a short distance where they join the larger bores, the possibility of clogging the minute passageways is reduced. An, small particle reaching them being readily blown through by the steam pressure behind them. The loss in steam velocity due to internal friction is reduced from what it would be if the minute passageways continued a considerable distance with their minute bore. Finally, the described arrangement of passageways is simple to construct. The intermediate passageways are first drilled by a drill passing through the main cavity, which may be formed in the body when it is cast. Such drilled openings extend well toward the edge of the bore and terminate in conical ends at the end of the drill. Then a fine drill provided with a guiding bushing is inserted in the intermediate passageway and the minute openings are drilled from the conical ends of the intermediate ends of the intermediate passageways.

Any suitable means may be employed for controlling admission of the steam to the pipe 0, for instance the well known arrangement may be used of a valve controlling such admission connected with the fuel doors B operating to open the valve whenever the doors are open, then a dashpot may be employed, preventing the immediate closing of the valve when the doors are closed and resulting in the spray of steam continuing for the length of time desired. Such controlling arrangements being well known, they are not herein shown, but may be employed if desired; or if desired the control may be purely manual by means of hand valves.

Having thus described my invention, what I claimis:

A nozzle of the class described having a body comprising a comparatively large main cavity leading from one side of the nozzle and tern'iinating'in a row at such discharge side, and a lip overhanging such minute passageways'and having the flat under face inclined at an angle to the plane of such discharge passageways, the plane of such lip face joining the discharge face of the nozzle adjacent the upper edge of the passageways.

In testimony whereof, Ihereunto aflix my signature.

THOMAS lV. MCCUIG. 

